Steam generator



June 20, 1933. H. STROTHOFF STEAM GENERATOR Original Filed Feb. 26, 1925 2 Sheets-Sheet l Julie 20, 1933. H STRQTHOFF 1,914,538 4 STEAM GENERATOR Original Filed Feb. 26, 1925 2 Sheets-Sheet 2 Patented June 2%, 1933 1 3 7 UNITED srrns PATENT FEC HERMANN STRGTHOFF, OF DUISBERG, GERMANY, ASSIGNOR TO I'll-IE BABCOCK & \R ILUOX COMPANY, OF NEW YORK, N. Y.

STEAM GENERATOR Application filed February 26, 1925, Serial No. 11,881, and. in Germany February 26, 1924. Renewed September 8, 1932.

Thisinvention relates to a water tube boil- 41 is a fragmentary view, drawn to a larger erhaving sectional headers of sinuous forscale, looking in the direction of the arrow mation connected by staggered rows of E in Fig. 1; Fig. 5 is a longitudinal section V inclined tubes. 1 of a modified construction of water tube boil- 5- According to the invention the header secer; Fig. 6 is a part rear elevation part sec- 55 tions at one end of the stack of tubes are tion on the line 6-6 of Fig. 5, and Fig. 7 is laterally offset or displaced relatively to the a view generally similar to Fig. 8 illustratheader sections at the other end, so that ading the offset relation of the headers of the W joining header sections are interconnected upper tubular system of Figs. 5 and 6.

by way of the water-tubes, whereby, say in The boiler shown in Figs. 1 comprises 00 the adaptation of the invention to a unit a pair of upper steam and water drums 3, 1, comprising two steam and water drums eX- coupled at the ends to sinuous headers contending side by 'ide, at least one vertical nected by inclined tubes.

staggered row comprises tubes alternate ones As will beseen from the figures, the water of which are connected to header sections tubes 1 from the header section 5 lead at 65 coupled to one drum, while the other tubes 1a into the opposite header section 6, which of that row are connected to header sections again communicates by way of the tubes 2a, coupled to the other drum, so that, with the 2, with the header section 7. The remaining a drums communicating with one another in header sections 712 are similarly interconthis way, balancing of the condition of the nected. Successive tubes connected to a 70.

water contents of the two drums is assured given header, therefore, are connected alteras to concentrationof solids and water level. nately to two adjacent headers at the oppo- The invention is of particular importance site end of the boiler, so that there are tubes in connection with boilers for high presconnected to a header in one unit which comsures and small water contents (pressures municate with adjacent drums of two units up to 10 to 100 atmospheres). through the adjacent headers at the opposite More especally in the adaptation of the end of the boiler to which the said successive invention to a high pressure boiler there may tubes are connected. The tubes connected to u be substituted for the usual upper steam and a given header at one end of the drum, therewater drum an upper tubular systemcomfore, are divided into two groups connected prising header sect-ions connected by prefrespectively to adjacent headers at the oppoerably slightly inclined tubes and arranged site end of the boiler.

as above described, these header sections be- In the modified construction shown in ing connected with the associated header sec- Flgs. 5 and 6 there 1s substltuted for the uptions of the generating system. per longitudinal drums an upper tubular Preferably the tubes of the bottom horisystem comprising sectional headers 13, 14, zontal row of the upper system are uniform interconnected by slightly inclined tubes 15 in diameterthe same as the tubes of the in the manner described in connection with .a generating systemand adapted to hold Figs. 1-4.

cover plates which cut the upper system out As will be observed, the tubes 16 of the 9 of the path of the gases, while the remaining bottom horizontal row of the upper system tubes of the upper system are of relatively are of the same diameter as the generating large diameter but bottle-necked or contracttubes 17 and serve to hold cover plates 18 ed at the ends where they are expanded into which cut the tubes 15 out of the path of the the header sections. gases. YVith the tubes 15 thus cut out of the The invention is illustrated in the accompath of the gases the deposit of large quantipanying drawings, in which Fig. 1 is an ele ties of boiler scale in these tubes is not to be vation of part of a water tube boiler; Fig. feared. It is thus practicable to employ 2 is a section on the line 2 2 of 1; Fig. larger tubes, bottle-necked at the ends, 3 is a section on the line 33 of Fig. 2; Fig. whereby the water and steam space is increasedthe contraction of the tube diameters at the expanding points rendering the latter better able to withstand high pressures. There are thus, in the arrangement illustrated in Figs. 5 and 6, two upper steam and water separating sections. The arrangement here illustrated is particularly applicable to high-pressure boilers and where the drums would necessarily be of abnormal thickness. One of the advantages of such an arrangement is that in case of damage due, for example, to corrosion, the damaged tubes may be replaced without disturbing other tubes of the boiler, whereas with a drum, in case of such damage, the entire drum must be replaced.

1. A water tube boiler comprising a generating system and a steam and water separating system located above said generating system, each system including sectional headers, the headers of the generatingsystem at each end of the tubes communicating with the associated headers of the separating system, tubes connecting said headers, tubes of the upper system having a larger diameter throughout the major portion of their length than the tubes of the generatingsystem. tubes of the upper section being contracted at their ends where they enter the headers whereby they maybe more closely spaced than would otherwise be possible, and a baflie disposed above said generating system for cutting the major portlon of said steam and water separating system out of the path of the hot gases.

2. A water tube boiler comprising a generating system including spaced water chambers connected by inclined tubes over which the gases flow and a steam and water separating system located above said generating system, said separating system comprising fluid chambers and tubes connecting said fluid chambers, said generating system communicating with said separating system and forming a circulation therewith, and means for cutting the major portion of said separating system out of the path of the hot gases. the tubes of said separating system having diameters greater throughout the major portion of their length than those of the generating system.

3. A water tube boiler comprising a generating system including spaced water chambers connected by inclined tubes over which the gases flow and a steam and water separating system located above said generating system, said separating system comprising fluid chambers and tubes connecting said fluid chambers, said generating system communicating with said separating system and forming a circulation therewith, and

means for cutting the major portion of said separating system out of the path of the hot gases, the tubes of the upper section being contracted where they enter said fluid chambers.

4. A water tube boiler comprising steam and water chambers located at the respective ends of the boiler, a steam generating system comprising inclined tubes located in the ath of the furnace gases and communicating at their ends with the respective chambers, the gases flowing upwardly over said tubes of said generating system, a steam and water separating system comprising substantially horizontal tubes connected at their ends to said steam and water chambers and located above said generating system, the diameters of the tubes of said separating system being .greater than those of the generating system and contracted at their ends where they enter said water chambers, and means for cutting the major portion of said separating system out of the path of the hot gases.

5. In a water tube boiler, a steam generating system comprising headers located at the respective ends of the boiler and connected by inclined tubes located in the path of the furnace gases, a steam and water separating system located above the steam generating system and comprising headers located at the respective ends of the boiler and tubes connecting said headers, the diameters of which are greater throughout the major portion of their length than those of the generating system, nipples connecting the head ers for the generating system to those of the separating system, and means for cutting the major portion of said separating system out of the path of the hot gases.

6. A water tube boiler comprising a generating system including spaced water chambers connected by inclined tubes over which heating gases flow, a steam and Water separating system located above said generating system, said separating system comprising steam and water chambers and tubes connecting said water chambers, said generating system communicating with said separating system and forming a circulation therewith, the water chambers at one end of said separating system being inter-connected, and means for cutting the major portion of said separating system out of the path of the hot gases, tubes of said separating system having diameters greater throughout the major portion of their length than those of the generating system.

7 A water tube boiler comprising a generating system including spaced water chambers connected by inclined tubes over which heating gases flow, and a steam and water separating system located above said generating system, said separating system comprising fluid chambers and tubes connecting said fluid chambers, said generating system communicating with said separating system and forming a circulation therewith. the tubes of the separating system being contracted Where they enter said fluid chambers.

8. A Water tube boiler comprising a generating system including Water chambers 5 connected by inclined tubes over Which heating gases flow, and a steam and Water separating system located above said generating system, said separating system comprising fluid chambers and tubes connecting said fluid chambers, said generating system communicating with said separating system and forming a circulation therewith, the tubes of the separating system being inclined oppositely to the inclination of the tubes of the generating system, the tubes of the separating system having diameters greater throughout the major portion of their length than those of the generating system.

In testimony whereof I have signed my name to this specification.

HERMANN STROTHOFF. 

